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ISL81601 데이터시트(PDF) 42 Page - Renesas Technology Corp

부품명 ISL81601
상세설명  60V Bidirectional 4-Switch Synchronous Buck-Boost Controller
PDF  54 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL81601 데이터시트(HTML) 42 Page - Renesas Technology Corp

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FN9299 Rev.3.1
Page 42 of 53
May 27, 2021
ISL81601
5. Functional Description
on the upper MOSFET, an action that boosts the 8V gate drive signal above VIN. The current required to drive the
upper MOSFET is drawn from the internal 8V regulator supplied from either VIN or EXTBIAS pin.
The BOOT to PHASE voltage is monitored internally. When the voltage drops to 5.95V at no switching condition,
a minimum off-time pulse is issued to turn off the upper MOSFET and turn on the low-side MOSFET to refresh the
bootstrap capacitor and maintain the upper driver bias voltage.
To optimize EMI performance or reduce phase node ringing, a small resistor can be placed between the BOOT pin
to the positive terminal of the bootstrap capacitor.
Figure 55. Upper Gate Driver Circuit
5.14
Power-Good Indicator
The power-good pin can monitor the status of the output voltage. PGOOD is true (open drain) 1.1ms after the
FB_OUT pin is within ±10% of the reference voltage.
There is no extra delay when the PGOOD pin is pulled LOW.
BOOT
UGATE
PHASE
VDD
VIN
ISL81601
CB
RBOOT
External
Schottky



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